What criteria or characteristics would you use to group living things versus nonliving things? Scientists have grappled with this question for years, and the debate is still ongoing in the scientific ...
Left: Structure of the Human Immunodeficiency Virus (HIV). Note the envelope protein that protects the virus against immunological detection and the small genome consisting of two short strands of RNA ...
Human immunodeficiency virus (HIV) is a germ that causes a lifelong infection that slowly weakens the immune system. Though the infection is lifelong, medicines can keep the virus in check and help ...
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